Electrically-heated soldering bolt or bit.



- a wsgmn M RWQOBHUUSE'L ELE CTRiCALLV HEATED SOIQDERING BOLT 0R BIT.

APPLICATION FILED 007. i8, 191;.

1,260,263 Patented Mar. 19, 1918 .2, 4 A f fly llll FRANCIS HUSBAND AND ALBERT ERNEST WOODHOUSE, OF LONDON, ENGLAND.

ELECTBICALIrY-HEATED SOLDIEBTNG BOLT OR BIT.

Specification of Letters Patent.

Patented Mar. 19, 1918.

Application filed Qctober 18, 1917. Serial No. 197,210.

To all whom it may concern:

Be it known that we, Fmnors HUSBAND and ALBERT ERNEST WOODHOUSE, subjects of His Majesty King George V of the United Kingdom of Great Britain and Ireland and of the British Dominions Beyond the Sea and Emperor of India, residing atLondon, England, have invented certain new and useful Improvements in Electrically- Heated Soldering Bolts or Bits, of which the following is a specification.

This invention relates to an improved construction of soldering-bolt or bit which is heated by the passage of an electric current through a circuit or through circuits of refractory substance of high resistance.

The improvements according to the present invention concern that type of electrically-heated soldering-bolt in which an insulator carrying a resistance wire is received by a copper or the like casing, and within the casing and leading from a bit, which bit is adapted to be detachably screwed to the corresponding end of the casing, is a copper or the, like stem, which stem projects into a hole in the resistance element, whereby heat from the resistance wire is conducted to the bit by the casing surrounding the resistance element and simultaneously also by the stem within it, and a rapid heating of the bit results.

The object of the invention is to rovide an improved construction of soldering-bolt of this type which shall have the advantage that the various component parts are of simple form and can be detachably combined together as a unit in a way that allows them to be readily put together, also to be readily taken apart for interchanging with others or for renewal or for other urposee also the advantages of good accessibility oi the conductin and resistance elements for easy renewa thereof and other purposesa removal of the bit, which is detachably connected with the stem, allowing the stem with the wound insulator thereon to be readily withdrawn as a whole from the open handle end of the casingalso efiicient insulation to prevent heating of the handle. a

The invention also aims at a construction which shall give notable manufacturing economies, particularly those economies which are incident to the fitting together of parts which are made in great numbers by machinery so as to be interchangeable, the kind of fitting together which compares with the assembling of a rifle.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a longitudinal section of a soldering-bolt constructed under this invention, while Figs. 2 to 8 are views of various parts before assemblage thereof toform the com.- plete tool shown in Fig. 1.

Fig. 2 is a central longitudinal section of an outer casing.

Fig. 3 is an end view of the casing looking from the upper end of Fig. 2.

Fig. 4 is a central longitudinal section of an extension casing.

Fig. 5 is a plan view of the parts shown in Fig. 4.

Fig. 6 is a side view of an end member shown in Fig. 1.

Fig. 7 is an end view of an end plate.

Fig. 8 is a similar view of an insulating su port.

asing all parts on or conforming all parts to either a cylinder or a cone'or a combination of both, for facilitating rapid repetition work, as for instance on a capstan lathe, a copper or the like bit-a is centrally recessed-at the back and the wall of the recess isscrew-threaded to screw on a like screw-threaded end of a copper or the like pin or bolt 6. For first screw-threading on the central pin or bolt, a radially shouldered-down copper or like disk 0' is provided, the shouldered-down portion (2 being at the bit side of the disk.

To fit slidingly over the disk co-axially with the pin or bolt is a cylindrical copper or the like casing e. This casing e, preferably by inside and outside rings riveted thereto, is provided with a flange at each end, presenting at the end corresponding-to the disk an internal flange f to co-act with the disk shoulder, and presenting at the other end an external flange .g for a purpose hereinafter appearing.

The disk 0 and with it the stem 6 is inserted in the casing e and positioned with the disk shoulder against the shoulder f. In

this position the disk end of the cylindrical casmg is arranged to come flush with the outer face of the disk 0, beyond which the screw-threaded part of the in or bolt b projects so that the tapped it or pointed end a may be screwed home to the outer face of the disk and to the end of the casing.

On that part ofthe pin or bolt 12 which extends into the cylinder 6 is fitted an insulator carrying the resistance wire, the heat from which is conducted to the bit a by the core or stem 1), wall 6 and end 0 simultaneously, thus giving a rapid passage of heat to the bit or pointed end (1. Also all the said parts can be readily fitted together and as readily taken apart, while the stem 1) with the disk 0 and the wound insulator on the stem 6 can be withdrawn as a whole from the open handle end of the casing c, after removing the bit a.

A built-up wire is provided by threading on the pin or bolt or stem 1) perforated disk-sections i of porcelain or the like and of a diameter suited for entering the cylindrical casing freely, i. e., leaving an air space between. These disk sections are longitudinally channeled at j for the reception of a resistance or resistances by preference of the helical coil type, the walls of the grooves bein preferably parallel to each other but 0 lique to the tangent of the outer curve and adjacent grooves of contiguous disk-sections running at opposite an les so that such adjacent grooves trend ivergently with respect to each other without however meeting or crossing each other in end-on aspect. Each disk will have a number of such channels set around its periphery and adjacent disks will be end-wise reversed to bring the adjacent grooves of contiguous disk sections at opposite angles to each other.

The heating chamber is so lengthwise packed with an insulator built up of such disks z together with appropriate insulation disk plates is that the application of an insulating and chamber closing disk Z to or 7 against the exteriorly shouldered end g of the cylindrical casing shall serve also to holdthe disks z' against movement. Positioning and securing of the insulating disk is arranged to be effected by the same means by which handle is secured to the bolt. Set around the exterior shouldered or flanged end 9 of the cylindrical casing e are a number of screw-threaded holes m running parallel with the axis of the tool. A correspondingly but plain holed ring n is co-axially applied to the outer face of the insulating disk I for clamping this down against the shouldered or flanged end 9 of the cylindrical casing e by set-screws 0 passing through the plain holes p in the ring and screwed into the screwed-holes m in the casing e. I

The insulating disk 3 is fixed against rotation by becoming engaged by the setscrews 0, c. g., by radial notches r in the insulator for the resistance ed at one endis screwed, this tube t being fitted with any suitable hand-hold w of wood or other suitable non-conducting material.

On the handle side of the insulatin disk are applied terminal plates a: :1 these ing screwed thereto from the bit side by terminal screws y y to which are connected the ends of the resistance wire or wires, and having screwed therein from the handle side the conductor terminal screws 2 z whence the usual flexible conductors pass through the hollow handle to the source of current.

What we claim is:-

1. Soldering-bolt of the type described having a closed end cylinder with a screwthreaded long pin or bolt projecting on opposite sides of the end wall to form a core or stem for the cylinder on the one hand and to take the working point formed as a screw cap nut on the other hand, and havin the cylinder length-wise packed with lon g1- tudinally grooved insulating disk-sections of the kind described provided with appropriate end-plate insulation, the insulating sections carrying a resistance circuit threaded on the composite cylindrical core, the insulating and supporting sections of the core being clamped against movement b an insulating disk closure, provided wit terminal plates, also conductor terminal screws, applied to the back end ofthe cylinder.

2. In a soldering-bolt as claimed in claim 1 hereof, securing the insulating disk closure by clamping between the back flanged end of the cylinder, and a clamping ring socured to said cylinder end by set screws with which notches in the disk closure periphery engage.

3. A soldering bolt'as claimed in claim 2 hereof, having the clamping ring with a threaded short tube in line with the axis of the cylinder, and a hand-hold carrying tube making screwed engagement with the short tube and allowing passage of the flexible conductors to a source of current.

4. A heating unit comprising a metallic casing, a-metallic bit at one end of said casing, an end member at the opposite end of said casing, a metallic central member extending from said bit substantially to said end member, insulating means mounted about said central member within said casconfined therein, means oonductively related to said terminals whereby conductors may be detachably secured thereto, and a handle secured in position to receive the conductors. 5. A soldering bolt comprising a casing, a

5 bit, a central member within said casing, and

a heating device within said casing comprising a, pluralit of separable insulating supports, each 0 which embraces said central member and is provided on its outer surface with a series of pockets for heating conductors.

In testimony whereof, we aflix oursignatures.

FRANCIS HUSBAND. ALBERT ERNEST WOODHOUSE. 

